kuser/kgetcred.c

   1 /*
   2  * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "kuser_locl.h"
  35
  36 static char *cache_str;
  37 static char *out_cache_str;
  38 static char *delegation_cred_str;
  39 static char *etype_str;
  40 static int transit_flag = 1;
  41 static int forwardable_flag;
  42 static int canonicalize_flag;
  43 static char *impersonate_str;
  44 static char *nametype_str;
  45 static int version_flag;
  46 static int help_flag;
  47
  48 struct getargs args[] = {
  49     { "cache",          'c', arg_string, &cache_str,
  50       NP_("credential cache to use", ""), "cache"},
  51     { "out-cache",      0,   arg_string, &out_cache_str,
  52       NP_("credential cache to store credential in", ""), "cache"},
  53     { "delegation-credential-cache",0,arg_string, &delegation_cred_str,
  54       NP_("where to find the ticket use for delegation", ""), "cache"},
  55     { "canonicalize",   0, arg_flag, &canonicalize_flag,
  56       NP_("canonicalize the principal", "") },
  57     { "forwardable",    0, arg_flag, &forwardable_flag,
  58       NP_("forwardable ticket requested", "")},
  59     { "transit-check",  0,   arg_negative_flag, &transit_flag },
  60     { "enctype",        'e', arg_string, &etype_str,
  61       NP_("encryption type to use", ""), "enctype"},
  62     { "impersonate",    0,   arg_string, &impersonate_str,
  63       NP_("client to impersonate", ""), "principal"},
  64     { "name-type",              0,   arg_string, &nametype_str },
  65     { "version",        0,   arg_flag, &version_flag },
  66     { "help",           0,   arg_flag, &help_flag }
  67 };
  68
  69 static void
  70 usage (int ret)
  71 {
  72     arg_printusage (args,
  73                     sizeof(args)/sizeof(*args),
  74                     NULL,
  75                     "service");
  76     exit (ret);
  77 }
  78
  79 int
  80 main(int argc, char **argv)
  81 {
  82     krb5_error_code ret;
  83     krb5_context context;
  84     krb5_ccache cache;
  85     krb5_creds *out;
  86     int optidx = 0;
  87     krb5_get_creds_opt opt;
  88     krb5_principal server;
  89     krb5_principal impersonate = NULL;
  90
  91     setprogname (argv[0]);
  92
  93     ret = krb5_init_context (&context);
  94     if (ret)
  95         errx(1, "krb5_init_context failed: %d", ret);
  96
  97     if(getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optidx))
  98         usage(1);
  99
 100     if (help_flag)
 101         usage (0);
 102
 103     if(version_flag) {
 104         print_version(NULL);
 105         exit(0);
 106     }
 107
 108     argc -= optidx;
 109     argv += optidx;
 110
 111     if (argc != 1)
 112         usage (1);
 113
 114     if(cache_str) {
 115         ret = krb5_cc_resolve(context, cache_str, &cache);
 116         if (ret)
 117             krb5_err (context, 1, ret, "%s", cache_str);
 118     } else {
 119         ret = krb5_cc_default (context, &cache);
 120         if (ret)
 121             krb5_err (context, 1, ret, "krb5_cc_resolve");
 122     }
 123
 124     ret = krb5_get_creds_opt_alloc(context, &opt);
 125     if (ret)
 126         krb5_err (context, 1, ret, "krb5_get_creds_opt_alloc");
 127
 128     if (etype_str) {
 129         krb5_enctype enctype;
 130
 131         ret = krb5_string_to_enctype(context, etype_str, &enctype);
 132         if (ret)
 133             krb5_errx (context, 1, N_("unrecognized enctype: %s", ""),
 134                        etype_str);
 135         krb5_get_creds_opt_set_enctype(context, opt, enctype);
 136     }
 137
 138     if (impersonate_str) {
 139         ret = krb5_parse_name(context, impersonate_str, &impersonate);
 140         if (ret)
 141             krb5_err (context, 1, ret, "krb5_parse_name %s", impersonate_str);
 142         krb5_get_creds_opt_set_impersonate(context, opt, impersonate);
 143         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_NO_STORE);
 144     }
 145
 146     if (out_cache_str)
 147         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_NO_STORE);
 148
 149     if (forwardable_flag)
 150         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
 151     if (!transit_flag)
 152         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_NO_TRANSIT_CHECK);
 153     if (canonicalize_flag)
 154         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_CANONICALIZE);
 155
 156     if (delegation_cred_str) {
 157         krb5_ccache id;
 158         krb5_creds c, mc;
 159         Ticket ticket;
 160
 161         krb5_cc_clear_mcred(&mc);
 162         ret = krb5_cc_get_principal(context, cache, &mc.server);
 163         if (ret)
 164             krb5_err (context, 1, ret, "krb5_cc_get_principal");
 165
 166         ret = krb5_cc_resolve(context, delegation_cred_str, &id);
 167         if(ret)
 168             krb5_err (context, 1, ret, "krb5_cc_resolve");
 169
 170         ret = krb5_cc_retrieve_cred(context, id, 0, &mc, &c);
 171         if(ret)
 172             krb5_err (context, 1, ret, "krb5_cc_retrieve_cred");
 173
 174         ret = decode_Ticket(c.ticket.data, c.ticket.length, &ticket, NULL);
 175         if (ret) {
 176             krb5_clear_error_message(context);
 177             krb5_err (context, 1, ret, "decode_Ticket");
 178         }
 179         krb5_free_cred_contents(context, &c);
 180
 181         ret = krb5_get_creds_opt_set_ticket(context, opt, &ticket);
 182         if(ret)
 183             krb5_err (context, 1, ret, "krb5_get_creds_opt_set_ticket");
 184         free_Ticket(&ticket);
 185
 186         krb5_cc_close (context, id);
 187         krb5_free_principal(context, mc.server);
 188
 189         krb5_get_creds_opt_add_options(context, opt,
 190                                        KRB5_GC_CONSTRAINED_DELEGATION);
 191     }
 192
 193     ret = krb5_parse_name(context, argv[0], &server);
 194     if (ret)
 195         krb5_err (context, 1, ret, "krb5_parse_name %s", argv[0]);
 196
 197     if (nametype_str) {
 198         ret = krb5_parse_nametype(context, nametype_str,
 199                                   &server->name.name_type);
 200         if (ret)
 201             krb5_err(context, 1, ret, "krb5_parse_nametype");
 202     }
 203
 204     ret = krb5_get_creds(context, opt, cache, server, &out);
 205     if (ret)
 206         krb5_err (context, 1, ret, "krb5_get_creds");
 207
 208     if (out_cache_str) {
 209         krb5_ccache id;
 210
 211         ret = krb5_cc_resolve(context, out_cache_str, &id);
 212         if(ret)
 213             krb5_err (context, 1, ret, "krb5_cc_resolve");
 214
 215         ret = krb5_cc_initialize(context, id, out->client);
 216         if(ret)
 217             krb5_err (context, 1, ret, "krb5_cc_initialize");
 218
 219         ret = krb5_cc_store_cred(context, id, out);
 220         if(ret)
 221             krb5_err (context, 1, ret, "krb5_cc_store_cred");
 222         krb5_cc_close (context, id);
 223     }
 224
 225     krb5_free_creds(context, out);
 226     krb5_free_principal(context, server);
 227     krb5_get_creds_opt_free(context, opt);
 228     krb5_cc_close (context, cache);
 229     krb5_free_context (context);
 230
 231     return 0;
 232 }